describe non-personal accounts: roles groups root

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diff --git a/README.md b/README.md
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 Each user has a single, personal account.
 
+Non-personal accounts can be created for roles or groups.
+Use a role for resources handed over (not put on hold) e.g. during a vacation.
+Use a project when multiple persons (now or later) should have equal access.
+
+A special account "root" with full access to all system resources
+is used only for administration purposes.
+
 The account, and what it provides access to, is protected by a personal
 [[password|intro]].